Errata

Incorrect: "Frames from the distribution system have the ToDS bit set, but the FromDS bit is 0." Should be: "Frames from the mobile station have the..."

Note from the Author or Editor:
This error is also present in the second edition, and an erratum for the second edition also exists.

ATM window

NOW READS:
ATIM window

On the "Infrastructure BSS" diagram in Figure 2-4, there is a dotted
line indicating a wireless connection between the two notebooks at the
bottom. While this would be accurate for a Independent BSS (ad-hoc BSS), it is
inacurate for the Infrastructure BSS, where all traffic
must pass first to the Access point (AP).

Note from the Author or Editor:
The figure was corrected in the second edition.

The subtype name for subtype value 0111 in Table 3-1 should be CF-Ack+CF-Poll rather
than Data+CF-Ack+CF-Poll.

Note from the Author or Editor:
This error was fixed in the second edition of the book.

In 2nd line under this heading,
"congestion-based data"
should be
"contention-based data"

The NAV for the RTS in Figure 3-17: "RTS=3xSIFS + Data + ACK"
NOW READS: "RTS=3xSIFS + CTS + Data + ACK"

in the WEP key lengh sidebar talking about the 128-bit WEP, Gast says, "After
subtracting 104 bits for the shared secret component of the RC4 key, only 104 bits
are secret", when he means something like "after subtracting the 24 bit
Initialization Vector component of the RC4 key, only 104 bits are secret."

Note from the Author or Editor:
The suggested correction should be applied.

The third paragraph says that "In [figure 10-1], the hopping pattern is {2,8,4,7}".
The figure shows {2,8,4,6}.

Note from the Author or Editor:
This error was corrected in the second edition.

Figure 10-15 shows the first side lobe extending 11Mhz out from the center frequency.
This is correct I believe.

Figure 10-16 shows the first side lobe extending out what appears to be about 5Mhz.
If it were 11Mhz then it would extend to almost the halfway point between Channels 1
and 6. The scale of the lobe pattern appears to be skewed.

Note from the Author or Editor:
The figure was replaced in the second edition. See Figure 12-7 for the new figure.

In the paragraph titled "Header" it says: "Five fields comprise the header:....".
It's wrong. It says twice the same field (Signal) so it should say "Four fields..."
and cite the Signal field only once.

The HR/DSSS PLCP framing diagram shows the length and CRC fields to be a mixture of 8
and 16 bits. Whereas the standard specifies them as all 16 bits.

AUTHOR: Yes, that is correct. Both the length and CRC fields should be 16 bits.
There are three changes necessary--I did get the CRC field length
right in the "short preamble" bar at the bottom of the figure, but the
length field is wrong. Both the CRC and length field are wrong in the
"long preamble" bar at the top.

A more elegant way to HUP a process is:

kill -1 `ps ax | grep "[c]ardmgr" | awk '{print $1}'`

You remove the u flag in ps aux since you don't care about the user running the
process. grep "[c]ardmgr" avoids having to use grep -v grep. We put the double quotes
in grep's argument to pass through the shell. Awk prints $1 since ps doesn't print
the user anymore.

Note from the Author or Editor:
This is a more elegant way to HUP a process. However, when the second edition was written, card services no longer needed as much hands-on management.

Ethereal now supports Lucent Orinoco under Linux, making
the statement "For data capture on Linux, only Intersil-based cards are supported."

See
http://www.ethereal.com/faq.html#q4.21

Note from the Author or Editor:
This erratum was fixed in the second edition (see page 556, third paragraph).